I NEED A REAL GURU ON THIS ONE!!! 1993 GMC K1500 5.0L Have changed most of the fuel system but still having issues of not wanting to start.

The truck is a standard cab with an 8ft bed and 131" wheel base if that makes any difference. So here is the scenario: the truck was having issues of starting and then would start to stall and I would need to feather the gas pedal to keep it running then do the two foot keeping the idle up and braking at lights to keep it from stalling to get it home. Did the Seafoam cleaning regimen in the throttle body, ran the motor a bit to clean it out and then changed plugs, wires, cap, rotor. Started and idled fine but the problem immediately came back when I went for a drive. Since then have installed new fuel pump, lines, pressure regulator, injectors, and throttle position sensor. Went for a drive and seemed to fix the problem. The same day I went back to start the vehicle and the same problem popped up again. This time it was a full tank of fuel but thankfully the pump had already been changed and is working properly so that is ruled out. Thinking of it now I am going to change the gas cap as well as that may be a problem but, beyond anything I have replaced, what other items parts could be causing this issue?? Give me a possibilities list in progression and I will eliminate each as I go to zero in on the problem. It sounds like others have had this issue but I haven't found where there has been a specific solution. Any help from a true guru would be greatly appreciated!! Thanks!! SK

4 Answers

Compression on all cylinders is
good. The engine has 75,000 on it
and when it decides to run it runs
beautifully. Now that I have replaced
the injectors and pressure regulator
it runs (when it decides to start)
even better than it did before. A lot
more consistent power on highway
hills. It fired up this morning, I let it
run for awhile, took it down the road
and back, and now coming back to
it to 4-5 hours later and try and start
it, it will not kick over. I sprayed a bit
of starting fluid into the open flaps
and it tried to kick so I getting
spark. This thing has me totally
stumped. When it starts it runs
perfect and idled perfect. Like new.
When it doesn't want to start it just
won't. If I come back in about 4-5
hours it wouldn't surprise me if it
kicked right over. What on earth
else could ther be short of changing
the ECM could it be???? And the
issue is not temperature related as it
would do this cold or marginally
warm here in New England. This
truck ran perfect until this situation
popped up before changing
anything fuel or electronic related.
So, that tells me it is either a part
that has worn out that can create an
intermittent issue or a condition that
can arise from a part that is on it's
way out none of which I have
described being already replaced,
know what I mean?? Really need
my damn truck!!! Grrrrr.......

Is there something in the ECM that
would tell the injectors to throw a
little fuel down the throttle body on
start up that may be an intermittent
issue or would something like that
just let go and not operate at all?
Can't think of anything else.

Oh, and I have changed out the gas
cap just in case there was an air
lock issue. The old cap did have a
bit of stickiness to it when I sucked
on it. And yes, I put my mouth on it
and sucked on the thing, lol,
because there really is no other way
to test the thing properly. :) So
aggravated at the moment. :(

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